JBCS

2:00, Wed Nov 22

Open Access/APCs

vol. 22, No. 4, 2011, p. 607-807

 

The Brazilian Chemical Industry - Challenges and Opportunities

Chemistry is a key sector in any economy, with a strong presence in practically all productive chains. It is no coincidence that the major world economies are also the leaders in the manufacturing of chemicals. Many countries have developed, created several employment opportunities, added value to their industries out of investments that started with the expansion in the production of chemicals.

(Read more at Editorial)



Editorial J. Braz. Chem. Soc. 2011, 22(4), 607-608

The Brazilian Chemical Industry - Challenges and Opportunities

Pedro Wongtschowski

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http://dx.doi.org/10.1590/S0103-50532011000400001


Review J. Braz. Chem. Soc. 2011, 22(4), 609-622

Comprehensive Two-Dimensional Gas Chromatography for Analysis of Volatile Compounds in Foods and Beverages

Juliane Elisa Welke; Cláudia Alcaraz Zini

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GC × GC color plot of a Brazilian base wine obtained with a polar and a medium-polar column set.

http://dx.doi.org/10.1590/S0103-50532011000400002

Published online: February 17, 2011

Articles J. Braz. Chem. Soc. 2011, 22(4), 623-636

Metal Halide Hydrates as Lewis Acid Catalysts for the Conjugated Friedel-Crafts Reactions of Indoles and Activated Olefins

Cristiane S. Schwalm; Marco Antonio Ceschi; Dennis Russowsky

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Metal halide hydrates are efficient catalysts to the Conjugate Friedel-Crafts reaction (CFC) of Indoles and activated olefins in alcoholic media. Solvent-free conditions were successful applied to prepare nitro-adducts and b-carbolines in good yields in an environmentally-friend protocol.

http://dx.doi.org/10.1590/S0103-50532011000400003

Published online: November 22, 2010


J. Braz. Chem. Soc. 2011, 22(4), 637-642

2D Chemical Drawings Correlate to Bioactivities: MIA-QSAR Modelling of Antimalarial Activities of 2,5-Diaminobenzophenone Derivatives

Rodrigo A. Cormanich; Matheus P. Freitas; Roberto Rittner

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QSAR based on 2D chemical images (MIA-QSAR) shows that bidimensional structures correlate with biological activities, and is a promising tool for the design of new antimalarial compounds, with modeling capability comparable to well established 3D approaches.

http://dx.doi.org/10.1590/S0103-50532011000400004

Published online: November 25, 2010


J. Braz. Chem. Soc. 2011, 22(4), 643-647

Quantification of Essential Fatty Acids in the Heads of Nile Tilapia (Oreochromis niloticus) Fed with Linseed Oil

Ana C. Aguiar; Solange M. Cottica; Marcela Boroski; Cláudio C. Oliveira; Elton G. Bonafé; Polyana B. França; Nilson E. Souza; Jesui V. Visentainer

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The fatty acid methyl esters (FAME) were prepared by methylation of the total lipids (TL) and separated by gas chromatography using as parameter the equivalent chain-length values (ECL) in the identification and flame Ionization detector response factors in the quantification.

http://dx.doi.org/10.1590/S0103-50532011000400005

Published online: November 25, 2010

J. Braz. Chem. Soc. 2011, 22(4), 648-651

Determination of p-Phenylenediamine by Perturbation of a Non-Equilibrium Stationary State in the B-Z Reaction

Jinzhang Gao; Xiaodong Chen Jie Ren; Wu Yang

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Figure A shows a regular oscillator being translating gradually into a non-equilibrium stationary state. Figure B shows a bifurcation point.

http://dx.doi.org/10.1590/S0103-50532011000400006

Published online: November 30, 2010

J. Braz. Chem. Soc. 2011, 22(4), 652-659

Electrochemical Feasibility Study of Methyl Parathion Determination on Graphite-Modified Basal Plane Pyrolytic Graphite Electrode

Leonardo Luiz Okumura; Adelir Aparecida Saczk; Marcelo Firmino de Oliveira; Ana Carolina C. Fulgêncio; Larissa Torrezani; Paulo Eduardo N. Gomes; Rosana M. Peixoto

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SWV optimized responses for different MP concentrations in supporting electrolyte 0.20 mol L-1 acetate buffer pH 5.2 and volume of graphite suspension as a modifier of 10 mL. Inset: calibration curve for MP.

http://dx.doi.org/10.1590/S0103-50532011000400007

Published online: November 30, 2010

J. Braz. Chem. Soc. 2011, 22(4), 660-668

Synthesis, Characterization and Catalytic Activity of Two Novel cis-Dioxovanadium(V) Complexes: [VO2(L)] and [VO2(HLox)]

Natália M. L. Silva; Carlos B. Pinheiro; Eluzir P. Chacon; Jackson A. L. C. Resende; José Walkimar de M. Carneiro; Tatiana L. Fernández; Marciela Scarpellini; Mauricio Lanznaster

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The complexes [VO2(L)] and [VO2(HLox)] were synthesized by the reaction of [VO(acac)2] with the ligands HL and H2Lox, respectively. Alternatively, [VO2(HLox)] was also obtained by the reaction of HL with [VO(acac)2] and hydroxylamine, or reacting [VO2(L)] with hydroxylamine.

http://dx.doi.org/10.1590/S0103-50532011000400008

Published online: December 2, 2010


J. Braz. Chem. Soc. 2011, 22(4), 669-676

EPR and Magnetic Studies of a Carboxylate-Bridged Dinuclear Copper(II) Compound: [Cu2(flu)4(dmf)2]

Otaciro R. Nascimento; Lia M. B. Napolitano; María H. Torre; Octavio Peña; Rafael Calvo

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In the GA we are showing the EPR line variation with temperature of single-crystal [Cu2(flu)4(dmf)2] compound and magnetic susceptibility versus temperature extracted from this measurements.

http://dx.doi.org/10.1590/S0103-50532011000400009

Published online: December 9, 2010

J. Braz. Chem. Soc. 2011, 22(4), 677-683

Pre-concentration of Lithium Prior to Its Determination in Honey by Flame Optical Emission Spectrometry

Helena Stecka; Pawel Pohl

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A procedure based on solid phase extraction with a strongly acidic cation-exchanger Dowex 50W×
8-200 was proposed to pre-concentrate and determine ultra-traces of Li in floral honeys. It enabled to determine from 0.4 to 5.3 ng g-1 of Li with precision being within 8-11%.

http://dx.doi.org/10.1590/S0103-50532011000400010

Published online: December 14, 2010

J. Braz. Chem. Soc. 2011, 22(4), 684-692

QSPR Modeling using Catalan Solvent and Solute Parameters

Abolghasem Jouyban; Mohammad A. A. Fakhree; Ali Shayanfar; Taravat Ghafourian

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The Catalan solvent parameters were used to develop a new set of solute parameters. The developed solute parameters were used to propose a novel model for predicting aqueous solubility of solutes. The Catalan solvent parameters were employed to develop models for representing a number of physico-chemical properties of the solvents.

http://dx.doi.org/10.1590/S0103-50532011000400011

Published online: December 16, 2010


J. Braz. Chem. Soc. 2011, 22(4), 693-701

Electrochemical Oxidation of Caffeic and Ferulic Acid Derivatives in Aprotic Medium

Magali Salas-Reyes; Javier Hernández; Zaira Domínguez; Felipe J. González; Pablo D. Astudillo; Rosa Elena Navarro; Evelin Martínez-Benavidez; Carlos Velázquez-Contreras; Samuel Cruz-Sánchez

How to cite this article

 

The electrochemical oxidation of a series of caffeic and ferulic acids derivatives as well as their corresponding redox moieties catechol and guaiacol was studied as a function of the structure in aprotic medium.

http://dx.doi.org/10.1590/S0103-50532011000400012

Published online: December 21, 2010


J. Braz. Chem. Soc. 2011, 22(4), 702-708

Binding Events of (S)-N-(3-Oxo-octanoyl)-homoserine Lactone with Agrobacterium tumefaciens Mutant Cells Studied by Saturation Transfer Difference NMR

Luís Fernando Cabeça; Armando Mateus Pomini; Pedro Luiz R. Cruz; Anita J. Marsaioli

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Upper Figure: Saturation of a liposome 1H NMR signal transferred to the complex liposome-homoserine lactone (HSL)and dissociation produce free homoserine lactone with saturated hydrogens. Lower Figure: First binding events of the quorum sensing phenomenum showing the HSL diffusing through the bacterium membrane.

http://dx.doi.org/10.1590/S0103-50532011000400013

Published online: January 13, 2011

J. Braz. Chem. Soc. 2011, 22(4), 709-717

Application of Pyrite and Chalcopyrite Electrodes for the Acid-Base Determinations in Nitriles

Zoran Simi; Zorka D. Stani; Milan Antonijevi

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In the course of the coulometric determinations of acids (bases) in non-aqueous solvents (AN and PN), the electrochemical generation of lyate (hydrogen) ions is performed by the reduction (oxidation) of an appropriate electroreactive compounds. The natural minerals pyrite (FeS2) and chalcopyrite (CuFeS2) have been used as the indicator electrodes.

http://dx.doi.org/10.1590/S0103-50532011000400014

Published online: January 18, 2011

J. Braz. Chem. Soc. 2011, 22(4), 718-725

Nanoporous of W/WO3 Thin Film Electrode Grown by Electrochemical Anodization Applied in the Photoelectrocatalytic Oxidation of the Basic Red 51 used in Hair Dye

Luciano E. Fraga; Maria Valnice B. Zanoni

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This image shows UV-Vis spectra and the present total color removal after 120 min of the 1.0 x10-5 mol L-1 basic red solution when treated by photoelectrocatalytic oxidation using both systems of irradiation (visible and ultraviolet) obtained before and after 120 min.

http://dx.doi.org/10.1590/S0103-50532011000400015

Published online: January 18, 2011

J. Braz. Chem. Soc. 2011, 22(4), 726-735

A Low-Cost Portable Microcontrolled Nephelometer for Potassium Determination

Vagner B. dos Santos; Thiago B. Guerreiro; Willian T. Suarez; Ronaldo C. Faria; Orlando Fatibello-Filho

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Low-cost portable microcontrolled nephelometer. a) Picture of the nephelometer developed; b) Schematic diagram of the optical compartment showing the blue LED and photodiode TSLB257 at 90º and infrared LED and TSL260R-LF at 90º.

http://dx.doi.org/10.1590/S0103-50532011000400016

Published online: January 18, 2011


J. Braz. Chem. Soc. 2011, 22(4), 736-740

Visible LED-Based Instrumentation for Photometric Determination of Electroosmotic Flow in Microchannels

José Alberto Fracassi da Silva; Ariane Deblire; Dosil P. de Jesus; Wendell Karlos T. Coltro

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In this article we demonstrate how to use an inexpensive instrumentation based on visible-high intensity LED and microscope for the determination of the electroosmotic flow in microseparation devices.

http://dx.doi.org/10.1590/S0103-50532011000400017

Published online: January 20, 2011


J. Braz. Chem. Soc. 2011, 22(4), 741-745

Chemical Analysis of Essential Oils from Ocotea gomezii W.C. Burger and Ocotea morae Gómez-Laur. (Lauraceae) Collected at

Carlos Chaverri; Cecilia Díaz; José F. Cicció

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Morphology of Ocotea morae (Lauraceae) and structural formulas of major constituents from leaves (b-pinene), bark (1,8-cineole) and wood [(E)-nerolidol] essential oils.

http://dx.doi.org/10.1590/S0103-50532011000400018

Published online: January 20, 2011


J. Braz. Chem. Soc. 2011, 22(4), 746-755

Development of Nano Poly(3-methyl thiophene)/Multiwalled Carbon Nanotubes Sensor for the Efficient Detection of Some Pesticides

Palaniappan Abirama Sundari; Paramasivam Manisankar

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We demonstrate the fabrication of nanosize poly(3-methyl thiophene) (P3MT)/ multiwalled carbon nanotubes (MWCNTs) modified glassy carbon (GCE) electrode for the sensitive determination of some common pesticides.

http://dx.doi.org/10.1590/S0103-50532011000400019

Published online: January 20, 2011

J. Braz. Chem. Soc. 2011, 22(4), 756-766

An Alternative Mechanism for the 1,4-Asymmetric Induction in the Stereoselective Addition of (R)-Pantolactone to 2-Phenylpropylketene

Alexander M. Silva; Clarissa O. da Silva; André G. H. Barbosa; Rosane A. Fontes; Sergio Pinheiro; Marco Edilson F. Lima; Rosane N. Castro

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Two possible mechanisms for the 1,4-asymmetric induction in the stereoselective addition of (R)-pantolactone to 2-phenylpropylketene.

http://dx.doi.org/10.1590/S0103-50532011000400020

Published online: January 25, 2011

J. Braz. Chem. Soc. 2011, 22(4), 767-771

Electrochemical Behavior and Determination of Fluconazole

Éric de S. Gil; Diogo D. Cordeiro; Ana E. B. Matias; Sílvia H. P. Serrano

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Voltammograms and the analytical curve obtained at glassy carbon electrode in 0.1 mol L-1 phosphate buffer solution, pH 8.0 obtained at glassy carbon electrode for blank and fluconazole solutions.

http://dx.doi.org/10.1590/S0103-50532011000400021

Published online: January 25, 2011

J. Braz. Chem. Soc. 2011, 22(4), 772-779

Nutrients in Amazonian Black Earth from Caxiuanã Region

Vanda P. Lemos; Antônio R. de Oliveira Meireles; Kelly das Graças Fernandes; Milena C. de Moraes; Marcondes L. da Costa; Any K. Terra Silva; Dirse C. Kern

How to cite this article

 

Trend of the concentrations of Mg, Ca, P and organic matter in archaeological black earth (ABE) at the site Ilha de Terra from Caxiuanã suggests placeholders as cemetery, religious ceremonies and food preparations by ancient inhabitants of this site.

http://dx.doi.org/10.1590/S0103-50532011000400022

Published online: January 27, 2011

J. Braz. Chem. Soc. 2011, 22(4), 780-789

Synthesis, Characterization and Photovoltaic Properties of Di-Anchoring Organic Dyes

Tzi-Yi Wu; Ming-Hsiu Tsao; Shyh-Gang Su; H. Paul Wang; Yuan-Chung Lin; Fu-Lin Chen; Cheng-Wen Chang; I-Wen Sun

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Organic dyes comprising carbazole, iminodibenzyl and phenothiazine moieties, respectively, as the electron donors and di-anchoring rhodanine rings as the electron acceptors are synthesized and evaluated for use in dye-sensitized solar cells. Solar cells employing these organic dyes show good overall conversion efficiency (up to 4.91%).

http://dx.doi.org/10.1590/S0103-50532011000400023

Published online: February 17, 2011


Short Reports J. Braz. Chem. Soc. 2011, 22(4), 790-795

Exhausted Yerba Mate Leaves (Ilex paraguariensis) as Biosorbent for the Removal of Metals from Aqueous Solutions

Guillermo J. Copello; Rodolfo E. Garibotti; Florencia Varela; María V. Tuttolomondo; Luis E. Diaz

How to cite this article

 

Exhausted yerba mate leaves (Ilex paraguariensis) demonstrated to effectively adsorb metals from aqueous solutions, such as Cr(VI), which suggest the applicability of this cost effective biosorbent.

http://dx.doi.org/10.1590/S0103-50532011000400024

Published online: January 18, 2011

J. Braz. Chem. Soc. 2011, 22(4), 796-800

New Adducts of Lapachol with Primary Amines

Mirelly D. F. Santos; José T. Litivack-Junior; Roberto V. Antunes; Tania M. S. Silva; Celso A. Camara

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In this reaction substituted phenazines are formed by the neat reaction of alkylamines with lapachol, and in the figure the nitrogens are painted in blue to emphazise that one of the ring is originated from a Strecker degradation reaction.

http://dx.doi.org/10.1590/S0103-50532011000400025

Published online: January 25, 2011


J. Braz. Chem. Soc. 2011, 22(4), 801-806

Fast Analysis of Taurine in Energetic Drinks by Electrospray Ionization Mass Spectrometry

Rodrigo R. Catharino; Renato Haddad; Helena T. Godoy; Marcos N. Eberlin; Leonardo S. Santos

How to cite this article

 

Direct infusion ESI-MS/MS in the negative ion mode using SRM (m/z 124 -> m/z 80) was applied with high confidence, speed and selectivity to quantifty taurine in energetic drinks.

http://dx.doi.org/10.1590/S0103-50532011000400026

Published online: January 25, 2011

Additions and Corrections J. Braz. Chem. Soc. 2011, 22(4), 807

Evaluation of Snake Venom Phospholipase A2: hydrolysis of Non-Natural Esters

Renan A. S. Pirolla; Paulo A. Baldasso; Sérgio Marangoni; Paulo J. S. Moran; José Augusto R. Rodrigues

How to cite this article

 

http://dx.doi.org/10.1590/S0103-50532011000400027

Online version ISSN 1678-4790 Printed version ISSN 0103-5053
Journal of the Brazilian Chemical Society
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